FIRST AMENDMENT TO CREDIT AGREEMENT

            FIRST AMENDMENT TO CREDIT AGREEMENT (this "First Amendment"), dated
as of September 25, 1996, among VERNITRON CORPORATION, a corporation organized
and existing under the laws of the State of Delaware (the "Borrower"), the
financial institutions party to the Credit Agreement referred to below (each a
"Bank" and, collectively, the "Banks"), and BANQUE PARIBAS, as agent (the
"Agent"). All capitalized terms used herein and not otherwise defined shall have
the respective meanings provided such terms in the Credit Agreement.

                              W I T N E S S E T H :

            WHEREAS, the Borrower, the Banks and the Agent are parties to a
Credit Agreement, dated as of April 25, 1996 (the "Credit Agreement");

            WHEREAS, the Borrower desires to purchase the business and certain
assets (the "Purchased Assets") of Lockheed Martin Beryllium Corporation and
enter into related transactions for an aggregate purchase price of approximately
$5,000,000 and to pay related fees and expenses not to exceed $200,000 in the
aggregate (collectively, the "Acquisition"), and the Banks are willing to
consent to the Acquisition, subject to and on the terms and conditions set forth
herein; and

            WHEREAS, the Borrower has requested that the Banks agree to amend
certain provisions of the Credit Agreement, and the Banks are willing to amend
such provisions, subject to and on the terms and conditions set forth herein;

            NOW, THEREFORE, it is agreed:

            1. Notwithstanding anything to the contrary contained in the Credit
Agreement, the undersigned Banks hereby consent to the Borrower effecting the
Acquisition, provided that (i) approximately $1,500,000 of the purchase price
for the Acquisition shall be obtained by the Borrower from the sale (including
as part of a sale-leaseback transaction) by the Borrower, contemporaneous with
the closing of the Acquisition, of a portion of the Purchased Assets, (ii) in
connection with the Acquisition, and promptly after the consummation thereof,
the Borrower shall receive cash proceeds (together with the proceeds described
in clause (i) above, the "Specified Proceeds") of approximately $800,000 from
the sale of a second portion of the Purchased Assets and (iii) no later than
thirty days after the closing of the Acquisition the Borrower shall grant to the
Collateral Agent a first priority perfected security interest in all Purchased
Assets (other than the property sold in the manner described in clauses (i) and
(ii) above), as set forth in Section 8.17 of the Credit Agreement.
Notwithstanding anything to the contrary contained in the Credit Agreement, the
Banks 



                                                                      SCHEDULE I
                                                                          Page 2


hereby further agree that (i) the Specified Proceeds shall not be required to be
applied as a mandatory repayment or commitment reduction, (ii) the acquisition
of the Purchased Assets shall not constitute a Capital Expenditure and (iii) the
Borrower shall be permitted to make an intercompany loan or advance to
Speedring, Inc. in connection with the consummation of the Acquisition.

            2. Section 1.01(c)(iii) of the Credit Agreement is hereby amended by
(1) inserting the text "the sum of (I)" immediately after the clause heading
"(y)" appearing therein; and (2) inserting the following new clause (II)
immediately after the text "at such time" appearing at the end of existing
clause (y):

      "and (II) the aggregate principal amount of all Swingline Loans (exclusive
      of Swingline Loans which are repaid with the proceeds of, and
      simultaneously with the incurrence of, the respective incurrence of
      Revolving Loans) then outstanding".

            3. Section 1.01 of the Credit Agreement is hereby further amended by
inserting in the appropriate order the following new paragraphs (d) and (e):

            "(d) Subject to and upon the terms and conditions set forth herein,
      the Swingline Bank agrees to make at any time and from time to time after
      the First Amendment Effective Date and prior to the Swingline Expiry Date,
      a loan or loans (each a "Swingline Loan," and collectively, the "Swingline
      Loans") to the Borrower, which Swingline Loans:

                  (i) shall be made and maintained as Base Rate Loans;

                  (ii) may be repaid and reborrowed in accordance with the
            provisions hereof;

                  (iii) shall not exceed in aggregate principal amount at any
            time outstanding, when combined with (x) the aggregate principal
            amount of all Revolving Loans then outstanding and (y) the amount of
            all Letter of Credit Outstandings at such time, an amount equal to
            the Total Revolving Loan Commitment at such time (after giving
            effect to any reductions to the Total Revolving Loan Commitment on
            such date); and

                  (iv) shall not exceed in aggregate principal amount at any
            time outstanding the Maximum Swingline Amount.



                                                                      SCHEDULE I
                                                                          Page 3


      The Swingline Bank shall not be obligated to make any Swingline Loans at a
      time when a Bank Default exists unless the Swingline Bank has entered into
      arrangements satisfactory to it to eliminate the Swingline Bank's risk
      with respect to the Bank which is subject of such Bank Default, including
      by cash collateralizing such Bank's Percentage of the outstanding
      Swingline Loans. Notwithstanding anything to the contrary contained in
      this Section 1.01(d), the Swingline Bank shall not make any Swingline Loan
      after receiving a written notice from the Borrower or the Required Banks
      stating that a Default or an Event of Default exists and is continuing
      until such time as the Swingline Bank shall have received written notice
      of (i) rescission of all such notices from the party or parties originally
      delivering such notice, (ii) the waiver of such Default or Event of
      Default by the Required Banks or (iii) the Agent in good faith believes
      that such Default or Event of Default has ceased to exist.

            (e) On any Business Day, the Swingline Bank may, in its sole
      discretion, give notice to the Banks that its outstanding Swingline Loans
      shall be funded with a Borrowing of Revolving Loans (provided that such
      notice shall be deemed to have been automatically given upon the
      occurrence of a Default or an Event of Default under Section 10.05 or upon
      the exercise of any of the remedies provided in the last paragraph of
      Section 10), in which case a Borrowing of Revolving Loans constituting
      Base Rate Loans (each such Borrowing, a "Mandatory Borrowing") shall be
      made on the immediately succeeding Business Day from all Banks with a
      Revolving Loan Commitment (without giving effect to any terminations
      and/or reductions thereto pursuant to the last paragraph of Section 10)
      pro rata on the basis of their respective Percentages (determined before
      giving effect to any termination of the Revolving Loan Commitments
      pursuant to the last paragraph of Section 10) and the proceeds thereof
      shall be applied directly to the Swingline Bank to repay the Swingline
      Bank for such outstanding Swingline Loans. Each such Bank hereby
      irrevocably agrees to make Revolving Loans upon one Business Day's notice
      pursuant to each Mandatory Borrowing in the amount and in the manner
      specified in the preceding sentence and on the date specified in writing
      by the Swingline Bank notwithstanding (i) the amount of the Mandatory
      Borrowing may not comply with the minimum amount for Borrowings otherwise
      required hereunder, (ii) whether any conditions specified in Section 5 or
      6 are then satisfied, (iii) whether a Default or an Event of Default then
      exists, (iv) the date of such Mandatory Borrowing, and (v) the amount of
      the Total Revolving Loan Commitment at such time. In the event that any
      Mandatory Borrowing cannot for any reason be made on the date otherwise
      required above (including, without limitation, as a result of the
      commencement of a proceeding under



                                                                      SCHEDULE I
                                                                          Page 4


      the Bankruptcy Code with respect to the Borrower), then each such Bank
      hereby agrees that it shall forthwith purchase (as of the date the
      Mandatory Borrowing would otherwise have occurred, but adjusted for any
      payments received from the Borrower on or after such date and prior to
      such purchase) from the Swingline Bank such participations in the
      outstanding Swingline Loans as shall be necessary to cause such Banks to
      share in such Swingline Loans ratably based upon their respective
      Percentages (determined before giving effect to any termination of the
      Revolving Loan Commitments pursuant to the last paragraph of Section 10);
      provided, that (x) all interest payable on the Swingline Loans shall be
      for the account of the Swingline Bank until the date as of which the
      respective participation is required to be purchased and, to the extent
      attributable to the purchased participation, shall be payable to the
      participant from and after such date and (y) at the time any purchase of
      participations pursuant to this sentence is actually made, the purchasing
      Bank shall be required to pay the Swingline Bank interest on the principal
      amount of participation purchased for each day from and including the day
      upon which the Mandatory Borrowing would otherwise have occurred to but
      excluding the date of payment for such participation, at the rate
      otherwise applicable to Revolving Loans maintained as Base Rate Loans
      hereunder for each day thereafter.

            4. Section 1.02 of the Credit Agreement is hereby amended by
inserting the following proviso to the first sentence appearing therein:

      "provided that Mandatory Borrowings shall be in the amounts required by
      Section 1.01(e)".

            5. Section 1.03 of the Credit Agreement is hereby amended by (1)
inserting the following parenthetical immediately after the text "Whenever the
Borrower desires to make a Borrowing hereunder" appearing in the first sentence
of paragraph (a):

      "(excluding Borrowings of Swingline Loans and Mandatory Borrowings)";

(2) redesignating paragraph "(b)" as paragraph "(c)"; (3) inserting the text ",
the Swingline Bank" immediately after the word "Agent" each place it appears in
the new paragraph (c); (4) inserting the text ", the Swingline Bank's"
immediately after the word "Agent's" where it appears in the new paragraph (c);
and (5) inserting the following new paragraph (b):

            "(b) (i) Whenever the Borrower desires to make a Borrowing of
      Swingline Loans hereunder, it shall give the Swingline Bank not later than
      1:00 p.m. (New York 



                                                                      SCHEDULE I
                                                                          Page 5


      time) on the date that a Swingline Loan is to be made, written notice (or
      telephonic notice confirmed in writing) of each Swingline Loan to be made
      hereunder. Each such notice shall be irrevocable and specify in each case
      (A) the date of Borrowing (which shall be a Business Day) and (B) the
      aggregate principal amount of Swingline Loans to be made pursuant to such
      Borrowing.

            (ii) Mandatory Borrowings shall be made upon the notice specified in
      Section 1.01(e), with the Borrower irrevocably agreeing, by its incurrence
      of any Swingline Loan, to the making of the Mandatory Borrowings as set
      forth in Section 1.01(e)."

            6. Section 1.04 of the Credit Agreement is hereby amended by
deleting the first sentence appearing therein in its entirety and inserting in
lieu thereof the following new sentence:

      "No later than 12:00 Noon (New York time) on the date specified in each
      Notice of Borrowing (or (x) in the case of Swingline Loans, no later than
      the close of business on the date specified pursuant to Section 1.03(b)(i)
      or (y) in case of Mandatory Borrowings, not later than 12:00 Noon (New
      York time) on the date specified in Section 1.01(e)), each Bank with a
      Commitment of the respective Tranche will make available its pro rata
      portion of each Borrowing requested to be made on such date (or in the
      case of Swingline Loans, the Swingline Bank shall make available the full
      amount thereof)."

            7. Section 1.05(a) of the Credit Agreement is hereby amended by (1)
deleting the word "and" appearing immediately before clause (iii); inserting the
word "and" immediately after clause (iii); and (3) inserting in the appropriate
order the following new clause (iv):

            "(iv) if Swingline Loans, by a promissory note duly executed and
      delivered by the Borrower substantially in the form of Exhibit B-4, with
      blanks appropriately completed in conformity herewith (the "Swingline
      Note")".

            8. Section 1.05 of the Credit Agreement is hereby further amended by
inserting in the appropriate order the following new paragraph (f):

            "(f) The Swingline Note issued to the Swingline Bank shall (i) be
      executed by the Borrower, (ii) be payable to the order of the Swingline
      Bank or its registered



                                                                      SCHEDULE I
                                                                          Page 6


      assigns and be dated the Initial Borrowing Date, (iii) be in a stated
      principal amount equal to the Maximum Swingline Amount and be payable in
      the principal amount of the outstanding Swingline Loans evidenced thereby
      from time to time, (iv) mature on the Swingline Expiry Date, (v) bear
      interest as provided in the appropriate clause of Section 1.08 in respect
      of the Base Rate Loans evidenced thereby, (vi) be subject to voluntary
      repayment as provided in Section 4.01 and mandatory repayment as provided
      in Section 4.02 and (vii) be entitled to the benefits of this Agreement
      and the other Credit Documents."

            9. Section 1.06 of the Credit Agreement is hereby amended by
inserting after the text "of the outstanding principal amount of the Loans" the
first time it appears therein the following parenthetical:

            "(other than Swingline Loans which may not be converted pursuant to
      this Section 1.06)".

            10. Section 1.12(x)(i) of the Credit Agreement is hereby amended by
(1) deleting the word "and" appearing immediately before clause (y); inserting
the word "and" immediately after clause (y); and inserting in the appropriate
order the following new clause (z):

      "(z) the Swingline Bank an amount equal to such Replaced Bank's Percentage
      of any Mandatory Borrowing to the extent such amount was not theretofore
      funded by such Replaced Bank".

            11. Section 2.01(c) of the Credit Agreement is hereby amended by
inserting the text "and Swingline Loans" immediately after the text "all
Revolving Loans" appearing in clause (i)(y).

            12. Section 4.01 of the Credit Agreement is hereby amended by (1)
inserting immediately after the text "one Business Day's prior written notice in
the case of Base Rate Loans" appearing in clause (i) the following
parenthetical:

      "(or same day notice in the case of Swingline Loans provided such notice
      is given prior to 12:00 noon (New York time))"; and

(2) inserting immediately after the number "$100,000" appearing in clause (ii)
the following parenthetical:



                                                                      SCHEDULE I
                                                                          Page 7


      "(or, in the case of Swingline Loans, $50,000 and, if greater, in an
      integral multiple of $50,000)".

            13. Section 4.02(A)(a) of the Credit Agreement is hereby amended by
(1) inserting immediately after the text "the aggregate outstanding principal
amount of the Revolving Loans" appearing in the first sentence, the new text ",
Swingline Loans"; (2) inserting immediately after the text "the Borrower shall
prepay" appearing in the first sentence, the new text "on such day principal of
Swingline Loans and after the Swingline Loans have been repaid in full,"; and
(3) inserting immediately before the text "all outstanding Revolving Loans"
appearing in the second sentence, the new text "all outstanding Swingline Loans
and".

            14. The Credit Agreement is hereby further amended by deleting
Section 4.02(B)(c) in its entirety and inserting in lieu thereof the following
new Section 4.02(B)(c):

            "(c) Notwithstanding anything to the contrary contained elsewhere in
      this Agreement, (i) all then outstanding Swingline Loans shall be repaid
      in full on the Swingline Expiry Date and (ii) all other outstanding Loans
      under each Tranche shall be repaid in full on the Maturity Date applicable
      to such Tranche."

            15. Section 4.03 of the Credit Agreement is hereby amended by
inserting immediately after the parenthetical "(New York time)" appearing
therein the following new parenthetical:

      "(or 1:00 p.m. (New York time) in the case of Swingline Loans)".

            16. The Credit Agreement is hereby further amended by deleting
Section 6.04(a) in its entirety and inserting in lieu thereof the following new
Section 6.04(a):

            "(a) Prior to the making of each Loan (other than a Swingline Loan
      or a Mandatory Borrowing), the Agent shall have received a Notice of
      Borrowing meeting the requirements of Section 1.03. Prior to the making of
      each Swingline Loan, the Swingline Bank shall have received the notice
      referred to in Section 1.03(b)(i)."



                                                                      SCHEDULE I
                                                                          Page 8


            17. Section 7.08(b) of the Credit Agreement is hereby amended by
inserting immediately after the text "All proceeds of Revolving Loans" where it
appears therein, the text "and Swingline Loans".

            18. Section 11 of the Credit Agreement is hereby amended by deleting
the definitions of 'Applicable Margin', 'Bank Default', 'Base Rate Loan',
'Borrowing', 'Loan', 'Note', 'Required Banks', 'Total Unutilized Revolving Loan
Commitment' and 'Tranche', and inserting in lieu thereof the following new
definitions in the appropriate alphabetical order:

            "'Applicable Margin' shall mean a percentage per annum equal to (i)
      (A) in the case of A Term Loans, Revolving Loans and Swingline Loans which
      are maintained as Base Rate Loans, 1.75% and (B) in the case of B Term
      Loans which are maintained as Base Rate Loans, 2.25% and (ii) (A) in the
      case of A Term Loans and Revolving Loans which are maintained as
      Eurodollar Loans, 3.25% and (B) in the case of B Term Loans which are
      maintained as Eurodollar Loans, 3.75%.

            'Bank Default' shall mean (i) the refusal (which has not been
      retracted) of a Bank to make available its portion of any Borrowing
      (including a Mandatory Borrowing) or to fund its portion of any
      unreimbursed payment under Section 2.04(c) or (ii) a Bank having notified
      in writing the Borrower and/or the Agent that it does not intend to comply
      with its obligations under Section 1.01 or 2, including in either case as
      a result of any takeover of such Bank by any regulatory authority or
      agency.

            'Base Rate Loan' shall mean (i) each Swingline Loan and (ii) each
      Loan designated or deemed designated as such by the Borrower at the time
      of the incurrence thereof or conversion thereto.

            'Borrowing' shall mean the borrowing of one Type of Loan of a single
      Tranche from all the Banks having Commitments with respect to such Tranche
      (or from the Swingline Bank in the case of Swingline Loans) on a pro rata
      basis on a given date (or resulting from a conversion or conversions on
      such date) having in the case of Eurodollar Loans the same Interest
      Period; provided, that Base Rate Loans incurred pursuant to Section
      1.10(b) shall be considered part of the related Borrowing of Eurodollar
      Loans.

            'Loan' shall mean each Term Loan, each Revolving Loan and each
      Swingline Loan.



                                                                      SCHEDULE I
                                                                          Page 9


            'Note' shall mean each A Term Note, each B Term Note, each Revolving
      Note and the Swingline Note.

            'Required Banks' shall mean Banks the sum of whose outstanding Term
      Loans, Term Loan Commitments (to the extent not theretofore terminated)
      and Revolving Loan Commitments (or after the termination thereof, the sum
      of outstanding Revolving Loans, Swingline Loans and Letter of Credit
      Outstandings), represent an amount greater than 50% of the sum of all
      outstanding Term Loans, the then Total Term Loan Commitments (to the
      extent not theretofore terminated) and the Total Revolving Loan Commitment
      (or after the termination thereof, the sum of the then total outstanding
      Revolving Loans, Swingline Loans and Letter of Credit Outstandings).

            'Total Unutilized Revolving Loan Commitment' shall mean, at any
      time, an amount equal to the remainder of (x) the then Total Revolving
      Loan Commitment, less (y) the sum of the aggregate principal amount of
      Revolving Loans and Swingline Loans then outstanding plus the then
      aggregate amount of Letter of Credit Outstandings.

            'Tranche' shall mean the respective facility and commitments
      utilized in making Loans hereunder, with there being four separate
      Tranches, i.e., whether A Term Loans, B Term Loans, Revolving Loans or
      Swingline Loans."

            19. Section 11 of the Credit Agreement is hereby further amended by
inserting into the definition of 'Excess Cash Flow' the text "or Swingline
Loans" immediately after the term "Revolving Loans" appearing in the
parenthetical contained in the proviso to clause (ii)(b).

            20. Section 11 of the Credit Agreement is hereby further amended by
inserting the following new definitions in the appropriate alphabetical order:

            "'First Amendment' shall mean the First Amendment, dated as of
      September 25, 1996, to this Agreement.

            'First Amendment Effective Date' shall have the meaning provided in
      the First Amendment.



                                                                      SCHEDULE I
                                                                         Page 10


            'Mandatory Borrowings' shall have the meaning provided in Section
      1.01(e).

            'Maximum Swingline Amount' shall mean $2,000,000.

            'Swingline Bank' shall mean Banque Paribas, in its capacity as the
      lender of Swingline Loans.

            'Swingline Expiry Date' shall mean the date which is three Business
      Days prior to the Revolving Loan Maturity Date.

            'Swingline Loans' shall have the meaning provided in Section
      1.01(d).

            'Swingline Note' shall have the meaning provided in Section
      1.05(a)."

            21. Section 13.12 of the Credit Agreement is hereby amended by
inserting the following new clause "(t)" in the appropriate order in the second
proviso to paragraph (a):

      "(t) without the consent of the Swingline Bank, amend, modify or waive any
      provision relating to the rights or obligations of the Swingline Bank or
      with respect to Swingline Loans (including, without limitation, the
      obligations of the other Banks with Revolving Loan Commitments to fund
      Mandatory Borrowings); or".

            22. The Credit Agreement is hereby further amended by inserting
Exhibit B-4 attached hereto as a new Exhibit thereto.

            23. On and after the First Amendment Effective Date, Schedule I to
the Credit Agreement is hereby amended by deleting the same in its entirety and
inserting in lieu thereof as a new Schedule I thereto the Schedule I attached
hereto which increases the Total Revolving Loan Commitment from $10,000,000 to
$11,000,000. Banque Paribas, in its capacity as a Bank, (the "Increasing Bank")
hereby acknowledges and agrees that from and after the First Amendment Effective
Date its Revolving Loan Commitment shall be the amount set forth opposite the
Increasing Bank's name on Schedule I attached hereto, as such amount may be
reduced from time to time in accordance with the terms of the Credit Agreement.

            24. The Company hereby agrees that on or after the First Amendment
Effective Date and upon the request of the Collateral Agent, it will execute
such amendments 



                                                                      SCHEDULE I
                                                                         Page 11


to the Mortgages as the Collateral Agent shall require in connection with the
transactions contemplated by this First Amendment.

            25. In order to induce the Banks to enter into this First Amendment,
the Borrower hereby represents and warrants that on the First Amendment
Effective Date, both before and after giving effect to this First Amendment, (1)
no Default or Event of Default shall exist and (2) all of the representations
and warranties contained in the Credit Documents shall be true and correct in
all material respects, with the same effect as though such representations and
warranties had been made on and as of the First Amendment Effective Date (it
being understood that any representation or warranty made as of a specific date
shall be true and correct in all material respects as of such specific date).

            26. This First Amendment is limited as specified and shall not
constitute a modification, acceptance or waiver of any other provision of the
Credit Agreement or any other Credit Document.

            27. This First Amendment may be executed in any number of
counterparts and by the different parties hereto on separate counterparts, each
of which counterparts when executed and delivered shall be an original, but all
of which shall together constitute one and the same instrument. A complete set
of counterparts shall be lodged with the Borrower and the Agent.

            28. THIS FIRST AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE
PARTIES HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAW
OF THE STATE OF NEW YORK.

            29. The headings of the several sections of this First Amendment are
inserted for convenience only and shall not in any way affect the meaning or
construction of any provision hereof.

            30. This First Amendment shall become effective as of the date
hereof (the "First Amendment Effective Date") when (1) each of the Borrower,
each Bank and the Collateral Agent shall have signed a copy hereof (whether the
same or different copies) and shall have delivered (including by way of
telecopier) the same to the Agent, (2) the Borrower shall have executed and
delivered to the Agent for the benefit of the Increasing Bank a new Revolving
Note reflecting the increase in the Revolving Loan Commitment of the Increasing



                                                                      SCHEDULE I
                                                                         Page 12


Bank and (4) the Borrower shall have executed and delivered to the Agent for the
benefit of the Swingline Bank a Swingline Note in the form of Exhibit B-4
hereto.

                                      * * *



                                                                      SCHEDULE I
                                                                         Page 13


            IN WITNESS WHEREOF, each of the parties hereto has caused a
counterpart of this First Amendment to be duly executed and delivered as of the
date first above written.


                                  VERNITRON CORPORATION


                                  By /s/ Elliot N. Konopko
                                     ---------------------------------
                                    Name:    Elliot N. Konopko
                                    Title:   Vice President


                                  BANQUE PARIBAS,
                                  Individually, as Agent and as Collateral Agent


                                  By /s/ Donald J. Ercole
                                     ---------------------------------
                                    Name:    Donald J. Ercole
                                    Title:   Vice President


                                  By /s/ Judith A. Kirstsner
                                     ---------------------------------
                                    Name:    Judith A. Kirstsner
                                    Title:   Assistant Vice President


                                  PRIME INCOME TRUST


                                  By /s/ /Rafael Scolari
                                     ---------------------------------
                                    Name:     Rafael Scolari
                                    Title:    Vice President -
                                               Portfolio Manager



                                                                      SCHEDULE I
                                                                         Page 14


                                   FIRST SOURCE FINANCIAL LLP,
                                   By First Source Financial, Inc.,
                                      its Agent/Manager


                                   By /s/ Thomas F. Thompson
                                     ---------------------------------
                                     Name:     Thomas F. Thompson
                                     Title:    Assistant Vice President


                                   IBJ SCHRODER BANK & TRUST COMPANY


                                   By /s/ Alllan J. Pagnotta
                                     ---------------------------------
                                     Name:     Allan J. Pagnotta
                                     Title:    Vice President



                                   THE FIRST NATIONAL BANK OF CHICAGO


                                   By /s/ S. Thomas Knoff
                                     ---------------------------------
                                     Name:     S. Thomas Knoff
                                     Title:    Vice President




                                                                      SCHEDULE I
                                                                         Page 15


                                   COMMITMENTS


                         A Term Loan         B Term Loan         Revolving Loan
Bank                      Commitment          Commitment           Commitment
- ----                     -----------         -----------         --------------

Banque Paribas            $4,700,000        $          0           $4,300,000

Prime Income Trust                 0           4,000,000                    0

First Source               3,500,000           3,000,000            2,500,000
Financial LLP

IBJ Schroder Bank &        2,900,000           2,500,000            2,100,000
Trust Company

The First National         2,900,000           2,500,000            2,100,000
Bank of Chicago

                         -----------         -----------          -----------
             Totals:     $14,000,000         $12,000,000          $11,000,000




                                                                     EXHIBIT B-4

                                 SWINGLINE NOTE

$2,000,000                                                    New York, New York
                                                                  April 25, 1996


            FOR VALUE RECEIVED, VERNITRON CORPORATION, a Delaware corporation
(the "Borrower"), hereby promises to pay to the order of BANQUE PARIBAS (the
"Bank"), in lawful money of the United States of America in immediately
available funds, at the office of Banque Paribas (the "Agent") located at 787
Seventh Avenue, New York, New York 10019, on the Swingline Expiry Date (as
defined in the Agreement referred to below) the principal sum of TWO MILLION
DOLLARS ($2,000,000) or, if less, the then unpaid principal amount of all
Swingline Loans (as defined in the Agreement referred to below) made by the Bank
pursuant to the Agreement.

            The Borrower promises also to pay interest on the unpaid principal
amount hereof in like money at said office from the date hereof until paid at
the rates and at the times provided in Section 1.08 of the Agreement referred to
below.

            This Note is the Swingline Note referred to in the Credit Agreement,
dated as of April 25, 1996, among the Borrower, the financial institutions from
time to time party thereto (including the Bank) and the Agent (as from time to
time in effect, the "Agreement") and is entitled to the benefits thereof. This
Note is also entitled to the benefits of the Subsidiaries Guaranty (as defined
in the Agreement) and is secured by and entitled to the benefits of the Security
Documents (as defined in the Agreement). As provided in the Agreement, this Note
is subject to voluntary prepayment and mandatory repayment prior to the
Swingline Expiry Date, in whole or in part.

            In case an Event of Default (as defined in the Agreement) shall
occur and be continuing, the principal of and accrued interest on this Note may
be declared to be due and payable in the manner and with the effect provided in
the Agreement.

            The Borrower hereby waives presentment, demand, protest or notice of
any kind in connection with this Note.

            THIS NOTE SHALL BE CONSTRUED IN ACCORDANCE WITH AND BE GOVERNED BY
THE LAW OF THE STATE OF NEW YORK.

                                                VERNITRON CORPORATION



                                                By__________________________
                                                Title: